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I experimented with this stuff last summer, but have lost my notes. You can
try it. I also tried plaster and fine sand (can be dusty) and cement mortar
mix (contains lime - can be nasty on hands), both mixed to that brown sugar
consistency. The sand has to be fine and homogenous.
I came upon the idea through a sculptor who was using casting cores
discarded from an auto plant. They were a sand mixture that was made solid
by an unknown binding agent. I didn't quite trust the material because of
an odd odor. His name is Michael Jackson, working in the Indianapolis area,
available for school workshops.
See what you can do.
South Ripley Elementary School
1568 South Benham Road
Versailles, IN 47042